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Webster 1913 Edition

Noun.

[See

, and

Triunity; trinity.

[Obs.]

As for terms of trinity,

triniunity

, . . . and the like, they reject them as scholastic notions.

Milton.

triniunity ‎(uncountable)

Obsolete form of triunity.
As for terms of trinity, triniunity, […] and the like, they reject them as scholastic notions. — Milton.